Yesterday downloaded Zimbra desktop build 1278 to my mac & all my yahoo accounts initially set up & synced very nicely. I wasn't however able to change account setup so I download the fix...which solved that issue.

Today none of my Yahoo accounts sync. In account setup, the status of my accounts is "error." When I try to reset my account information following is the message I get:
"Service error. Please check your server settings; verify your email address, password or IMAP access (if required).
Is there a fix for this?